Lindsay Lohan has been transported to a hospital after she was found unconscious in a hotel room, Eyewitness News has learned. The Los Angeles County Fire Department got the emergency call at about 10:15 a.m. Friday. The actress was found unconscious in the penthouse of the Ritz-Carlton Hotel in Marina del Rey. Her condition is currently unknown.

Sources tell TMZ ... Lindsay had been shooting almost non-stop -- without sleep -- for 2 days and was staying at the Ritz Carlton Hotel in Marina del Rey to get some sleep.  She has been shooting parts of her movie near the hotel.

We're told someone became alarmed because they could not wake her up and the person called 911. Paramedics responded, and determined nothing was wrong with Lindsay.  They left without transporting her to the hospital.